Mechanical-telephone diaphragm



( o Model.)

W. TAYLOR.

MECHANICAL TELEPHONE DIAPHRAGM.

No. 335,321. Patented Feb. 2, 1 886.

III

INVENTOR 7f ATTORNEYS.

- a button, 5, that rests against the face of the diaphragm of each ofthe instruments, the wire being tightly drawn, so that each of thesprings g is slightly contracted, the general UNITED STATES PATENTOFFICE,

WILLIAM TAYLOR, 0F NILES, MICHIGAN.

MECHANICAL TELEPHONE DIAPHRAGM SPECIFICATION forming part of LettersPatent No. 335,321, dated February 2,1886.

Application filed August 1, 1885.

To aZZ whom it may concern.-

Be it known that I, WILLIAM TAYLOR, of Niles, in the county of Berrienand State of Michigan, have invented a new and Improved MechanicalTelephone and Automatic Call, of which the following is a full, clear,and exact description.

This invention relates, in general, to telephones, having reference moreparticularly to the diaphragm; and it consists of the detailedconstruction of the diaphragm, substantially as hereinafter set forth,and pointed out in the claim.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a vertical sectional elevation of a mechanical telephoneembodying my invention. Fig. 2 is a face view of the same, a portion ofthe casing being cut away to disclose the diaphragm. Fig. 3 is a view,on a reduced scale, of two telephones and their connections; and Fig. 4is a view of the edge of the diaphragm, a portion of the same beingshown in section.

The casing A, in which I prefer to mount my improved form of diaphragm,consists of a circular faceplate, (1, provided with a mouth-piece, P,and a back plate, 0, in which there is formed an annular recess, 0,within which the edge of the diaphragm d rests, so that the face of thediaphragm will be flush with the rim 0 of the plate I), the diaphragmbeing held against the plate by the nails .9 s. The plates a and I) areunited by screws f f, which also pass through the outer edge of thediaphragm, and to the back of the plate there is secured a U-spring, g,the short arm of which is fixed to the side wall or to asupporting-block, 7i.

Two instruments, such as the one described, are connected by a wire orcord, j, each end of which passes through the spring 9 and plate I), toand through the diaphragm, to be fixed to Serial No. 173,235. (Nomodel.)

arrangement of the line being best shown in Fig. 3.

In order that each instrument may have a call attachment, a bell, k, issecured to the short arm Z, of a looped wire, on, the long arm of which.is rigidly fixed to the back of the plate I).

To sound a call, the instrument at the transmitting end of the line,which may be either instrument, is slightly pushed toward the block itand suddenly released, which movement will at first slaeken the tensionon the other instrument and then restore the tension with a jerk, whichwill cause the wire on to vibrate, and will ring the bell is to call thedesired party to that end of the line. A spiral or straight springwhether of wood, steel, rubber, or other suitable material, would,equally with the U-shaped spring, answer the purpose, which is, inaddition to that mentioned, of affording a means for sounding an alarmor call, to supply a mounting attachment that will be slightly yielding,in order that the line will always be in operative condition in spite ofsudden changes in the temperature, for when the instruments are mountedas described the springs will give if the wirej is contracted by intensecold, and will take up any slack caused by the expansion of the line invery hot weather.

My improved diaphragm is made of alternate layers of wood or straw pulppressed into the form of thin sheets or boards and strong cloth, as isbest shown in Fig. 4, two or three thicknesses of each style of materialbeing united by any suitable cement. Such a diaphragm is strong anddurable, and reproduces the messages in clear and soft tones.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent A diaphragm consisting of alternate layers ofpressed pulp and cloth united by cement, substantially as described.

\VILLIAM TAYLOR.

lVitn esses:

JACOB B. U LLREY, EDWIN P. KELLoeo.

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